Is it normal to not want a family?

In my 30s, female, single. I cannot stand the idea of having a family of my own because it would be extremely overwhelming. I spent most of my life helping my parents and basically living their lives for them (doing things for them, making decisions, etc) and that wore me out. The idea that I'd do it again with a husband and kids terrifies me because I've come to absolutely hate helping other people, even if it's irrational. Like, I could not handle a 2 year old not dressing themselves and that I would have to do it for them -- even though that is a completely irrational thought because obvi a 2 year old isn't capable of doing that on their own.

I also don't trust men after my few relationships ended up with every one of them randomly dumping me and leaving. I would be scared of it happening again if I actually built a life with someone else. It's so easy for people to leave me.

I hate feeling this way but I also don't. I'm mostly scared of being along when I'm old and possibly being poor and having no one to fall back on. Also having no one around if I get sick or have an emergency.